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![Geoff Lansberry](/assets/img/avatar_default.png)
In prior commits the selected clock frequency does not propagate correctly to what is written to the TRF7970A_MODULATOR_SYS_CLK_CTRL register. Signed-off-by: Geoff Lansberry <geoff@kuvee.com> Acked-by: Mark Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2274 lines
62 KiB
C
2274 lines
62 KiB
C
/*
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* TI TRF7970a RFID/NFC Transceiver Driver
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*
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* Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: Erick Macias <emacias@ti.com>
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* Author: Felipe Balbi <balbi@ti.com>
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* Author: Mark A. Greer <mgreer@animalcreek.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/netdevice.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <linux/nfc.h>
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#include <linux/skbuff.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/consumer.h>
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#include <net/nfc/nfc.h>
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#include <net/nfc/digital.h>
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/* There are 3 ways the host can communicate with the trf7970a:
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* parallel mode, SPI with Slave Select (SS) mode, and SPI without
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* SS mode. The driver only supports the two SPI modes.
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*
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* The trf7970a is very timing sensitive and the VIN, EN2, and EN
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* pins must asserted in that order and with specific delays in between.
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* The delays used in the driver were provided by TI and have been
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* confirmed to work with this driver. There is a bug with the current
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* version of the trf7970a that requires that EN2 remain low no matter
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* what. If it goes high, it will generate an RF field even when in
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* passive target mode. TI has indicated that the chip will work okay
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* when EN2 is left low. The 'en2-rf-quirk' device tree property
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* indicates that trf7970a currently being used has the erratum and
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* that EN2 must be kept low.
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*
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* Timeouts are implemented using the delayed workqueue kernel facility.
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* Timeouts are required so things don't hang when there is no response
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* from the trf7970a (or tag). Using this mechanism creates a race with
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* interrupts, however. That is, an interrupt and a timeout could occur
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* closely enough together that one is blocked by the mutex while the other
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* executes. When the timeout handler executes first and blocks the
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* interrupt handler, it will eventually set the state to IDLE so the
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* interrupt handler will check the state and exit with no harm done.
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* When the interrupt handler executes first and blocks the timeout handler,
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* the cancel_delayed_work() call will know that it didn't cancel the
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* work item (i.e., timeout) and will return zero. That return code is
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* used by the timer handler to indicate that it should ignore the timeout
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* once its unblocked.
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*
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* Aborting an active command isn't as simple as it seems because the only
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* way to abort a command that's already been sent to the tag is so turn
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* off power to the tag. If we do that, though, we'd have to go through
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* the entire anticollision procedure again but the digital layer doesn't
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* support that. So, if an abort is received before trf7970a_send_cmd()
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* has sent the command to the tag, it simply returns -ECANCELED. If the
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* command has already been sent to the tag, then the driver continues
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* normally and recieves the response data (or error) but just before
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* sending the data upstream, it frees the rx_skb and sends -ECANCELED
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* upstream instead. If the command failed, that error will be sent
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* upstream.
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*
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* When recieving data from a tag and the interrupt status register has
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* only the SRX bit set, it means that all of the data has been received
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* (once what's in the fifo has been read). However, depending on timing
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* an interrupt status with only the SRX bit set may not be recived. In
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* those cases, the timeout mechanism is used to wait 20 ms in case more
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* data arrives. After 20 ms, it is assumed that all of the data has been
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* received and the accumulated rx data is sent upstream. The
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* 'TRF7970A_ST_WAIT_FOR_RX_DATA_CONT' state is used for this purpose
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* (i.e., it indicates that some data has been received but we're not sure
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* if there is more coming so a timeout in this state means all data has
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* been received and there isn't an error). The delay is 20 ms since delays
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* of ~16 ms have been observed during testing.
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*
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* When transmitting a frame larger than the FIFO size (127 bytes), the
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* driver will wait 20 ms for the FIFO to drain past the low-watermark
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* and generate an interrupt. The low-watermark set to 32 bytes so the
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* interrupt should fire after 127 - 32 = 95 bytes have been sent. At
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* the lowest possible bit rate (6.62 kbps for 15693), it will take up
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* to ~14.35 ms so 20 ms is used for the timeout.
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*
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* Type 2 write and sector select commands respond with a 4-bit ACK or NACK.
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* Having only 4 bits in the FIFO won't normally generate an interrupt so
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* driver enables the '4_bit_RX' bit of the Special Functions register 1
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* to cause an interrupt in that case. Leaving that bit for a read command
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* messes up the data returned so it is only enabled when the framing is
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* 'NFC_DIGITAL_FRAMING_NFCA_T2T' and the command is not a read command.
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* Unfortunately, that means that the driver has to peek into tx frames
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* when the framing is 'NFC_DIGITAL_FRAMING_NFCA_T2T'. This is done by
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* the trf7970a_per_cmd_config() routine.
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*
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* ISO/IEC 15693 frames specify whether to use single or double sub-carrier
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* frequencies and whether to use low or high data rates in the flags byte
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* of the frame. This means that the driver has to peek at all 15693 frames
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* to determine what speed to set the communication to. In addition, write
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* and lock commands use the OPTION flag to indicate that an EOF must be
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* sent to the tag before it will send its response. So the driver has to
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* examine all frames for that reason too.
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*
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* It is unclear how long to wait before sending the EOF. According to the
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* Note under Table 1-1 in section 1.6 of
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* http://www.ti.com/lit/ug/scbu011/scbu011.pdf, that wait should be at least
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* 10 ms for TI Tag-it HF-I tags; however testing has shown that is not long
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* enough so 20 ms is used. So the timer is set to 40 ms - 20 ms to drain
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* up to 127 bytes in the FIFO at the lowest bit rate plus another 20 ms to
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* ensure the wait is long enough before sending the EOF. This seems to work
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* reliably.
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*/
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#define TRF7970A_SUPPORTED_PROTOCOLS \
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(NFC_PROTO_MIFARE_MASK | NFC_PROTO_ISO14443_MASK | \
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NFC_PROTO_ISO14443_B_MASK | NFC_PROTO_FELICA_MASK | \
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NFC_PROTO_ISO15693_MASK | NFC_PROTO_NFC_DEP_MASK)
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#define TRF7970A_AUTOSUSPEND_DELAY 30000 /* 30 seconds */
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#define TRF7970A_13MHZ_CLOCK_FREQUENCY 13560000
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#define TRF7970A_27MHZ_CLOCK_FREQUENCY 27120000
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#define TRF7970A_RX_SKB_ALLOC_SIZE 256
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#define TRF7970A_FIFO_SIZE 127
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/* TX length is 3 nibbles long ==> 4KB - 1 bytes max */
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#define TRF7970A_TX_MAX (4096 - 1)
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#define TRF7970A_WAIT_FOR_TX_IRQ 20
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#define TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT 20
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#define TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT 20
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#define TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF 40
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/* Guard times for various RF technologies (in us) */
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#define TRF7970A_GUARD_TIME_NFCA 5000
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#define TRF7970A_GUARD_TIME_NFCB 5000
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#define TRF7970A_GUARD_TIME_NFCF 20000
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#define TRF7970A_GUARD_TIME_15693 1000
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/* Quirks */
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/* Erratum: When reading IRQ Status register on trf7970a, we must issue a
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* read continuous command for IRQ Status and Collision Position registers.
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*/
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#define TRF7970A_QUIRK_IRQ_STATUS_READ BIT(0)
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#define TRF7970A_QUIRK_EN2_MUST_STAY_LOW BIT(1)
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/* Direct commands */
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#define TRF7970A_CMD_IDLE 0x00
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#define TRF7970A_CMD_SOFT_INIT 0x03
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#define TRF7970A_CMD_RF_COLLISION 0x04
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#define TRF7970A_CMD_RF_COLLISION_RESPONSE_N 0x05
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#define TRF7970A_CMD_RF_COLLISION_RESPONSE_0 0x06
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#define TRF7970A_CMD_FIFO_RESET 0x0f
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#define TRF7970A_CMD_TRANSMIT_NO_CRC 0x10
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#define TRF7970A_CMD_TRANSMIT 0x11
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#define TRF7970A_CMD_DELAY_TRANSMIT_NO_CRC 0x12
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#define TRF7970A_CMD_DELAY_TRANSMIT 0x13
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#define TRF7970A_CMD_EOF 0x14
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#define TRF7970A_CMD_CLOSE_SLOT 0x15
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#define TRF7970A_CMD_BLOCK_RX 0x16
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#define TRF7970A_CMD_ENABLE_RX 0x17
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#define TRF7970A_CMD_TEST_INT_RF 0x18
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#define TRF7970A_CMD_TEST_EXT_RF 0x19
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#define TRF7970A_CMD_RX_GAIN_ADJUST 0x1a
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/* Bits determining whether its a direct command or register R/W,
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* whether to use a continuous SPI transaction or not, and the actual
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* direct cmd opcode or regster address.
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*/
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#define TRF7970A_CMD_BIT_CTRL BIT(7)
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#define TRF7970A_CMD_BIT_RW BIT(6)
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#define TRF7970A_CMD_BIT_CONTINUOUS BIT(5)
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#define TRF7970A_CMD_BIT_OPCODE(opcode) ((opcode) & 0x1f)
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/* Registers addresses */
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#define TRF7970A_CHIP_STATUS_CTRL 0x00
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#define TRF7970A_ISO_CTRL 0x01
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#define TRF7970A_ISO14443B_TX_OPTIONS 0x02
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#define TRF7970A_ISO14443A_HIGH_BITRATE_OPTIONS 0x03
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#define TRF7970A_TX_TIMER_SETTING_H_BYTE 0x04
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#define TRF7970A_TX_TIMER_SETTING_L_BYTE 0x05
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#define TRF7970A_TX_PULSE_LENGTH_CTRL 0x06
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#define TRF7970A_RX_NO_RESPONSE_WAIT 0x07
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#define TRF7970A_RX_WAIT_TIME 0x08
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#define TRF7970A_MODULATOR_SYS_CLK_CTRL 0x09
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#define TRF7970A_RX_SPECIAL_SETTINGS 0x0a
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#define TRF7970A_REG_IO_CTRL 0x0b
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#define TRF7970A_IRQ_STATUS 0x0c
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#define TRF7970A_COLLISION_IRQ_MASK 0x0d
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#define TRF7970A_COLLISION_POSITION 0x0e
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#define TRF7970A_RSSI_OSC_STATUS 0x0f
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#define TRF7970A_SPECIAL_FCN_REG1 0x10
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#define TRF7970A_SPECIAL_FCN_REG2 0x11
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#define TRF7970A_RAM1 0x12
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#define TRF7970A_RAM2 0x13
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#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS 0x14
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#define TRF7970A_NFC_LOW_FIELD_LEVEL 0x16
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#define TRF7970A_NFCID1 0x17
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#define TRF7970A_NFC_TARGET_LEVEL 0x18
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#define TRF79070A_NFC_TARGET_PROTOCOL 0x19
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#define TRF7970A_TEST_REGISTER1 0x1a
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#define TRF7970A_TEST_REGISTER2 0x1b
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#define TRF7970A_FIFO_STATUS 0x1c
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#define TRF7970A_TX_LENGTH_BYTE1 0x1d
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#define TRF7970A_TX_LENGTH_BYTE2 0x1e
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#define TRF7970A_FIFO_IO_REGISTER 0x1f
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/* Chip Status Control Register Bits */
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#define TRF7970A_CHIP_STATUS_VRS5_3 BIT(0)
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#define TRF7970A_CHIP_STATUS_REC_ON BIT(1)
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#define TRF7970A_CHIP_STATUS_AGC_ON BIT(2)
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#define TRF7970A_CHIP_STATUS_PM_ON BIT(3)
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#define TRF7970A_CHIP_STATUS_RF_PWR BIT(4)
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#define TRF7970A_CHIP_STATUS_RF_ON BIT(5)
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#define TRF7970A_CHIP_STATUS_DIRECT BIT(6)
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#define TRF7970A_CHIP_STATUS_STBY BIT(7)
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/* ISO Control Register Bits */
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#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_662 0x00
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#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_662 0x01
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#define TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648 0x02
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#define TRF7970A_ISO_CTRL_15693_SGL_1OF256_2648 0x03
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#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a 0x04
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#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_667 0x05
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#define TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669 0x06
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#define TRF7970A_ISO_CTRL_15693_DBL_1OF256_2669 0x07
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#define TRF7970A_ISO_CTRL_14443A_106 0x08
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#define TRF7970A_ISO_CTRL_14443A_212 0x09
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#define TRF7970A_ISO_CTRL_14443A_424 0x0a
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#define TRF7970A_ISO_CTRL_14443A_848 0x0b
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#define TRF7970A_ISO_CTRL_14443B_106 0x0c
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#define TRF7970A_ISO_CTRL_14443B_212 0x0d
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#define TRF7970A_ISO_CTRL_14443B_424 0x0e
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#define TRF7970A_ISO_CTRL_14443B_848 0x0f
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#define TRF7970A_ISO_CTRL_FELICA_212 0x1a
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#define TRF7970A_ISO_CTRL_FELICA_424 0x1b
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#define TRF7970A_ISO_CTRL_NFC_NFCA_106 0x01
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#define TRF7970A_ISO_CTRL_NFC_NFCF_212 0x02
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#define TRF7970A_ISO_CTRL_NFC_NFCF_424 0x03
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#define TRF7970A_ISO_CTRL_NFC_CE_14443A 0x00
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#define TRF7970A_ISO_CTRL_NFC_CE_14443B 0x01
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#define TRF7970A_ISO_CTRL_NFC_CE BIT(2)
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#define TRF7970A_ISO_CTRL_NFC_ACTIVE BIT(3)
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#define TRF7970A_ISO_CTRL_NFC_INITIATOR BIT(4)
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#define TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE BIT(5)
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#define TRF7970A_ISO_CTRL_RFID BIT(5)
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#define TRF7970A_ISO_CTRL_DIR_MODE BIT(6)
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#define TRF7970A_ISO_CTRL_RX_CRC_N BIT(7) /* true == No CRC */
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#define TRF7970A_ISO_CTRL_RFID_SPEED_MASK 0x1f
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/* Modulator and SYS_CLK Control Register Bits */
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#define TRF7970A_MODULATOR_DEPTH(n) ((n) & 0x7)
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#define TRF7970A_MODULATOR_DEPTH_ASK10 (TRF7970A_MODULATOR_DEPTH(0))
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#define TRF7970A_MODULATOR_DEPTH_OOK (TRF7970A_MODULATOR_DEPTH(1))
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#define TRF7970A_MODULATOR_DEPTH_ASK7 (TRF7970A_MODULATOR_DEPTH(2))
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#define TRF7970A_MODULATOR_DEPTH_ASK8_5 (TRF7970A_MODULATOR_DEPTH(3))
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#define TRF7970A_MODULATOR_DEPTH_ASK13 (TRF7970A_MODULATOR_DEPTH(4))
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#define TRF7970A_MODULATOR_DEPTH_ASK16 (TRF7970A_MODULATOR_DEPTH(5))
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#define TRF7970A_MODULATOR_DEPTH_ASK22 (TRF7970A_MODULATOR_DEPTH(6))
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#define TRF7970A_MODULATOR_DEPTH_ASK30 (TRF7970A_MODULATOR_DEPTH(7))
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#define TRF7970A_MODULATOR_EN_ANA BIT(3)
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#define TRF7970A_MODULATOR_CLK(n) (((n) & 0x3) << 4)
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#define TRF7970A_MODULATOR_CLK_DISABLED (TRF7970A_MODULATOR_CLK(0))
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#define TRF7970A_MODULATOR_CLK_3_6 (TRF7970A_MODULATOR_CLK(1))
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#define TRF7970A_MODULATOR_CLK_6_13 (TRF7970A_MODULATOR_CLK(2))
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#define TRF7970A_MODULATOR_CLK_13_27 (TRF7970A_MODULATOR_CLK(3))
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#define TRF7970A_MODULATOR_EN_OOK BIT(6)
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#define TRF7970A_MODULATOR_27MHZ BIT(7)
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#define TRF7970A_RX_SPECIAL_SETTINGS_NO_LIM BIT(0)
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#define TRF7970A_RX_SPECIAL_SETTINGS_AGCR BIT(1)
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#define TRF7970A_RX_SPECIAL_SETTINGS_GD_0DB (0x0 << 2)
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#define TRF7970A_RX_SPECIAL_SETTINGS_GD_5DB (0x1 << 2)
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#define TRF7970A_RX_SPECIAL_SETTINGS_GD_10DB (0x2 << 2)
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#define TRF7970A_RX_SPECIAL_SETTINGS_GD_15DB (0x3 << 2)
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#define TRF7970A_RX_SPECIAL_SETTINGS_HBT BIT(4)
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#define TRF7970A_RX_SPECIAL_SETTINGS_M848 BIT(5)
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#define TRF7970A_RX_SPECIAL_SETTINGS_C424 BIT(6)
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#define TRF7970A_RX_SPECIAL_SETTINGS_C212 BIT(7)
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#define TRF7970A_REG_IO_CTRL_VRS(v) ((v) & 0x07)
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#define TRF7970A_REG_IO_CTRL_IO_LOW BIT(5)
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#define TRF7970A_REG_IO_CTRL_EN_EXT_PA BIT(6)
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#define TRF7970A_REG_IO_CTRL_AUTO_REG BIT(7)
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/* IRQ Status Register Bits */
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#define TRF7970A_IRQ_STATUS_NORESP BIT(0) /* ISO15693 only */
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#define TRF7970A_IRQ_STATUS_NFC_COL_ERROR BIT(0)
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#define TRF7970A_IRQ_STATUS_COL BIT(1)
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#define TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR BIT(2)
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#define TRF7970A_IRQ_STATUS_NFC_RF BIT(2)
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#define TRF7970A_IRQ_STATUS_PARITY_ERROR BIT(3)
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#define TRF7970A_IRQ_STATUS_NFC_SDD BIT(3)
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#define TRF7970A_IRQ_STATUS_CRC_ERROR BIT(4)
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#define TRF7970A_IRQ_STATUS_NFC_PROTO_ERROR BIT(4)
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#define TRF7970A_IRQ_STATUS_FIFO BIT(5)
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#define TRF7970A_IRQ_STATUS_SRX BIT(6)
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#define TRF7970A_IRQ_STATUS_TX BIT(7)
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#define TRF7970A_IRQ_STATUS_ERROR \
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(TRF7970A_IRQ_STATUS_COL | \
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TRF7970A_IRQ_STATUS_FRAMING_EOF_ERROR | \
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TRF7970A_IRQ_STATUS_PARITY_ERROR | \
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TRF7970A_IRQ_STATUS_CRC_ERROR)
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#define TRF7970A_RSSI_OSC_STATUS_RSSI_MASK (BIT(2) | BIT(1) | BIT(0))
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#define TRF7970A_RSSI_OSC_STATUS_RSSI_X_MASK (BIT(5) | BIT(4) | BIT(3))
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#define TRF7970A_RSSI_OSC_STATUS_RSSI_OSC_OK BIT(6)
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#define TRF7970A_SPECIAL_FCN_REG1_COL_7_6 BIT(0)
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#define TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL BIT(1)
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#define TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX BIT(2)
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#define TRF7970A_SPECIAL_FCN_REG1_SP_DIR_MODE BIT(3)
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#define TRF7970A_SPECIAL_FCN_REG1_NEXT_SLOT_37US BIT(4)
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#define TRF7970A_SPECIAL_FCN_REG1_PAR43 BIT(5)
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#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_124 (0x0 << 2)
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#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_120 (0x1 << 2)
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_112 (0x2 << 2)
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 (0x3 << 2)
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_4 0x0
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_8 0x1
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_16 0x2
|
|
#define TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32 0x3
|
|
|
|
#define TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(v) ((v) & 0x07)
|
|
#define TRF7970A_NFC_LOW_FIELD_LEVEL_CLEX_DIS BIT(7)
|
|
|
|
#define TRF7970A_NFC_TARGET_LEVEL_RFDET(v) ((v) & 0x07)
|
|
#define TRF7970A_NFC_TARGET_LEVEL_HI_RF BIT(3)
|
|
#define TRF7970A_NFC_TARGET_LEVEL_SDD_EN BIT(5)
|
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_4BYTES (0x0 << 6)
|
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_7BYTES (0x1 << 6)
|
|
#define TRF7970A_NFC_TARGET_LEVEL_LD_S_10BYTES (0x2 << 6)
|
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106 BIT(0)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212 BIT(1)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424 (BIT(0) | BIT(1))
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B BIT(2)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 BIT(3)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_FELICA BIT(4)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_RF_L BIT(6)
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_RF_H BIT(7)
|
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_106A \
|
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_PAS_106 | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
|
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_106B \
|
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_PAS_14443B | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_106)
|
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_212F \
|
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_212)
|
|
|
|
#define TRF79070A_NFC_TARGET_PROTOCOL_424F \
|
|
(TRF79070A_NFC_TARGET_PROTOCOL_RF_H | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_RF_L | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_FELICA | \
|
|
TRF79070A_NFC_TARGET_PROTOCOL_NFCBR_424)
|
|
|
|
#define TRF7970A_FIFO_STATUS_OVERFLOW BIT(7)
|
|
|
|
/* NFC (ISO/IEC 14443A) Type 2 Tag commands */
|
|
#define NFC_T2T_CMD_READ 0x30
|
|
|
|
/* ISO 15693 commands codes */
|
|
#define ISO15693_CMD_INVENTORY 0x01
|
|
#define ISO15693_CMD_READ_SINGLE_BLOCK 0x20
|
|
#define ISO15693_CMD_WRITE_SINGLE_BLOCK 0x21
|
|
#define ISO15693_CMD_LOCK_BLOCK 0x22
|
|
#define ISO15693_CMD_READ_MULTIPLE_BLOCK 0x23
|
|
#define ISO15693_CMD_WRITE_MULTIPLE_BLOCK 0x24
|
|
#define ISO15693_CMD_SELECT 0x25
|
|
#define ISO15693_CMD_RESET_TO_READY 0x26
|
|
#define ISO15693_CMD_WRITE_AFI 0x27
|
|
#define ISO15693_CMD_LOCK_AFI 0x28
|
|
#define ISO15693_CMD_WRITE_DSFID 0x29
|
|
#define ISO15693_CMD_LOCK_DSFID 0x2a
|
|
#define ISO15693_CMD_GET_SYSTEM_INFO 0x2b
|
|
#define ISO15693_CMD_GET_MULTIPLE_BLOCK_SECURITY_STATUS 0x2c
|
|
|
|
/* ISO 15693 request and response flags */
|
|
#define ISO15693_REQ_FLAG_SUB_CARRIER BIT(0)
|
|
#define ISO15693_REQ_FLAG_DATA_RATE BIT(1)
|
|
#define ISO15693_REQ_FLAG_INVENTORY BIT(2)
|
|
#define ISO15693_REQ_FLAG_PROTOCOL_EXT BIT(3)
|
|
#define ISO15693_REQ_FLAG_SELECT BIT(4)
|
|
#define ISO15693_REQ_FLAG_AFI BIT(4)
|
|
#define ISO15693_REQ_FLAG_ADDRESS BIT(5)
|
|
#define ISO15693_REQ_FLAG_NB_SLOTS BIT(5)
|
|
#define ISO15693_REQ_FLAG_OPTION BIT(6)
|
|
|
|
#define ISO15693_REQ_FLAG_SPEED_MASK \
|
|
(ISO15693_REQ_FLAG_SUB_CARRIER | ISO15693_REQ_FLAG_DATA_RATE)
|
|
|
|
enum trf7970a_state {
|
|
TRF7970A_ST_PWR_OFF,
|
|
TRF7970A_ST_RF_OFF,
|
|
TRF7970A_ST_IDLE,
|
|
TRF7970A_ST_IDLE_RX_BLOCKED,
|
|
TRF7970A_ST_WAIT_FOR_TX_FIFO,
|
|
TRF7970A_ST_WAIT_FOR_RX_DATA,
|
|
TRF7970A_ST_WAIT_FOR_RX_DATA_CONT,
|
|
TRF7970A_ST_WAIT_TO_ISSUE_EOF,
|
|
TRF7970A_ST_LISTENING,
|
|
TRF7970A_ST_LISTENING_MD,
|
|
TRF7970A_ST_MAX
|
|
};
|
|
|
|
struct trf7970a {
|
|
enum trf7970a_state state;
|
|
struct device *dev;
|
|
struct spi_device *spi;
|
|
struct regulator *regulator;
|
|
struct nfc_digital_dev *ddev;
|
|
u32 quirks;
|
|
bool is_initiator;
|
|
bool aborting;
|
|
struct sk_buff *tx_skb;
|
|
struct sk_buff *rx_skb;
|
|
nfc_digital_cmd_complete_t cb;
|
|
void *cb_arg;
|
|
u8 chip_status_ctrl;
|
|
u8 iso_ctrl;
|
|
u8 iso_ctrl_tech;
|
|
u8 modulator_sys_clk_ctrl;
|
|
u8 special_fcn_reg1;
|
|
u8 io_ctrl;
|
|
unsigned int guard_time;
|
|
int technology;
|
|
int framing;
|
|
u8 md_rf_tech;
|
|
u8 tx_cmd;
|
|
bool issue_eof;
|
|
struct gpio_desc *en_gpiod;
|
|
struct gpio_desc *en2_gpiod;
|
|
struct mutex lock;
|
|
unsigned int timeout;
|
|
bool ignore_timeout;
|
|
struct delayed_work timeout_work;
|
|
};
|
|
|
|
static int trf7970a_cmd(struct trf7970a *trf, u8 opcode)
|
|
{
|
|
u8 cmd = TRF7970A_CMD_BIT_CTRL | TRF7970A_CMD_BIT_OPCODE(opcode);
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "cmd: 0x%x\n", cmd);
|
|
|
|
ret = spi_write(trf->spi, &cmd, 1);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - cmd: 0x%x, ret: %d\n", __func__, cmd,
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val)
|
|
{
|
|
u8 addr = TRF7970A_CMD_BIT_RW | reg;
|
|
int ret;
|
|
|
|
ret = spi_write_then_read(trf->spi, &addr, 1, val, 1);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
|
|
ret);
|
|
|
|
dev_dbg(trf->dev, "read(0x%x): 0x%x\n", addr, *val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf,
|
|
size_t len)
|
|
{
|
|
u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;
|
|
struct spi_transfer t[2];
|
|
struct spi_message m;
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);
|
|
|
|
spi_message_init(&m);
|
|
|
|
memset(&t, 0, sizeof(t));
|
|
|
|
t[0].tx_buf = &addr;
|
|
t[0].len = sizeof(addr);
|
|
spi_message_add_tail(&t[0], &m);
|
|
|
|
t[1].rx_buf = buf;
|
|
t[1].len = len;
|
|
spi_message_add_tail(&t[1], &m);
|
|
|
|
ret = spi_sync(trf->spi, &m);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_write(struct trf7970a *trf, u8 reg, u8 val)
|
|
{
|
|
u8 buf[2] = { reg, val };
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "write(0x%x): 0x%x\n", reg, val);
|
|
|
|
ret = spi_write(trf->spi, buf, 2);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - write: 0x%x 0x%x, ret: %d\n", __func__,
|
|
buf[0], buf[1], ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_read_irqstatus(struct trf7970a *trf, u8 *status)
|
|
{
|
|
int ret;
|
|
u8 buf[2];
|
|
u8 addr;
|
|
|
|
addr = TRF7970A_IRQ_STATUS | TRF7970A_CMD_BIT_RW;
|
|
|
|
if (trf->quirks & TRF7970A_QUIRK_IRQ_STATUS_READ) {
|
|
addr |= TRF7970A_CMD_BIT_CONTINUOUS;
|
|
ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
|
|
} else {
|
|
ret = spi_write_then_read(trf->spi, &addr, 1, buf, 1);
|
|
}
|
|
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - irqstatus: Status read failed: %d\n",
|
|
__func__, ret);
|
|
else
|
|
*status = buf[0];
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_read_target_proto(struct trf7970a *trf, u8 *target_proto)
|
|
{
|
|
int ret;
|
|
u8 buf[2];
|
|
u8 addr;
|
|
|
|
addr = TRF79070A_NFC_TARGET_PROTOCOL | TRF7970A_CMD_BIT_RW |
|
|
TRF7970A_CMD_BIT_CONTINUOUS;
|
|
|
|
ret = spi_write_then_read(trf->spi, &addr, 1, buf, 2);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - target_proto: Read failed: %d\n",
|
|
__func__, ret);
|
|
else
|
|
*target_proto = buf[0];
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_mode_detect(struct trf7970a *trf, u8 *rf_tech)
|
|
{
|
|
int ret;
|
|
u8 target_proto, tech;
|
|
|
|
ret = trf7970a_read_target_proto(trf, &target_proto);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (target_proto) {
|
|
case TRF79070A_NFC_TARGET_PROTOCOL_106A:
|
|
tech = NFC_DIGITAL_RF_TECH_106A;
|
|
break;
|
|
case TRF79070A_NFC_TARGET_PROTOCOL_106B:
|
|
tech = NFC_DIGITAL_RF_TECH_106B;
|
|
break;
|
|
case TRF79070A_NFC_TARGET_PROTOCOL_212F:
|
|
tech = NFC_DIGITAL_RF_TECH_212F;
|
|
break;
|
|
case TRF79070A_NFC_TARGET_PROTOCOL_424F:
|
|
tech = NFC_DIGITAL_RF_TECH_424F;
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "%s - mode_detect: target_proto: 0x%x\n",
|
|
__func__, target_proto);
|
|
return -EIO;
|
|
}
|
|
|
|
*rf_tech = tech;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void trf7970a_send_upstream(struct trf7970a *trf)
|
|
{
|
|
dev_kfree_skb_any(trf->tx_skb);
|
|
trf->tx_skb = NULL;
|
|
|
|
if (trf->rx_skb && !IS_ERR(trf->rx_skb) && !trf->aborting)
|
|
print_hex_dump_debug("trf7970a rx data: ", DUMP_PREFIX_NONE,
|
|
16, 1, trf->rx_skb->data, trf->rx_skb->len,
|
|
false);
|
|
|
|
trf->state = TRF7970A_ST_IDLE;
|
|
|
|
if (trf->aborting) {
|
|
dev_dbg(trf->dev, "Abort process complete\n");
|
|
|
|
if (!IS_ERR(trf->rx_skb)) {
|
|
kfree_skb(trf->rx_skb);
|
|
trf->rx_skb = ERR_PTR(-ECANCELED);
|
|
}
|
|
|
|
trf->aborting = false;
|
|
}
|
|
|
|
trf->cb(trf->ddev, trf->cb_arg, trf->rx_skb);
|
|
|
|
trf->rx_skb = NULL;
|
|
}
|
|
|
|
static void trf7970a_send_err_upstream(struct trf7970a *trf, int errno)
|
|
{
|
|
dev_dbg(trf->dev, "Error - state: %d, errno: %d\n", trf->state, errno);
|
|
|
|
cancel_delayed_work(&trf->timeout_work);
|
|
|
|
kfree_skb(trf->rx_skb);
|
|
trf->rx_skb = ERR_PTR(errno);
|
|
|
|
trf7970a_send_upstream(trf);
|
|
}
|
|
|
|
static int trf7970a_transmit(struct trf7970a *trf, struct sk_buff *skb,
|
|
unsigned int len, u8 *prefix,
|
|
unsigned int prefix_len)
|
|
{
|
|
struct spi_transfer t[2];
|
|
struct spi_message m;
|
|
unsigned int timeout;
|
|
int ret;
|
|
|
|
print_hex_dump_debug("trf7970a tx data: ", DUMP_PREFIX_NONE,
|
|
16, 1, skb->data, len, false);
|
|
|
|
spi_message_init(&m);
|
|
|
|
memset(&t, 0, sizeof(t));
|
|
|
|
t[0].tx_buf = prefix;
|
|
t[0].len = prefix_len;
|
|
spi_message_add_tail(&t[0], &m);
|
|
|
|
t[1].tx_buf = skb->data;
|
|
t[1].len = len;
|
|
spi_message_add_tail(&t[1], &m);
|
|
|
|
ret = spi_sync(trf->spi, &m);
|
|
if (ret) {
|
|
dev_err(trf->dev, "%s - Can't send tx data: %d\n", __func__,
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
skb_pull(skb, len);
|
|
|
|
if (skb->len > 0) {
|
|
trf->state = TRF7970A_ST_WAIT_FOR_TX_FIFO;
|
|
timeout = TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT;
|
|
} else {
|
|
if (trf->issue_eof) {
|
|
trf->state = TRF7970A_ST_WAIT_TO_ISSUE_EOF;
|
|
timeout = TRF7970A_WAIT_TO_ISSUE_ISO15693_EOF;
|
|
} else {
|
|
trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
|
|
|
|
if (!trf->timeout)
|
|
timeout = TRF7970A_WAIT_FOR_TX_IRQ;
|
|
else
|
|
timeout = trf->timeout;
|
|
}
|
|
}
|
|
|
|
dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n", timeout,
|
|
trf->state);
|
|
|
|
schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void trf7970a_fill_fifo(struct trf7970a *trf)
|
|
{
|
|
struct sk_buff *skb = trf->tx_skb;
|
|
unsigned int len;
|
|
int ret;
|
|
u8 fifo_bytes;
|
|
u8 prefix;
|
|
|
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
|
|
if (ret) {
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(trf->dev, "Filling FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
|
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
|
|
|
|
/* Calculate how much more data can be written to the fifo */
|
|
len = TRF7970A_FIFO_SIZE - fifo_bytes;
|
|
if (!len) {
|
|
schedule_delayed_work(&trf->timeout_work,
|
|
msecs_to_jiffies(TRF7970A_WAIT_FOR_FIFO_DRAIN_TIMEOUT));
|
|
return;
|
|
}
|
|
|
|
len = min(skb->len, len);
|
|
|
|
prefix = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_FIFO_IO_REGISTER;
|
|
|
|
ret = trf7970a_transmit(trf, skb, len, &prefix, sizeof(prefix));
|
|
if (ret)
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
}
|
|
|
|
static void trf7970a_drain_fifo(struct trf7970a *trf, u8 status)
|
|
{
|
|
struct sk_buff *skb = trf->rx_skb;
|
|
int ret;
|
|
u8 fifo_bytes;
|
|
|
|
if (status & TRF7970A_IRQ_STATUS_ERROR) {
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
return;
|
|
}
|
|
|
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
|
|
if (ret) {
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(trf->dev, "Draining FIFO - fifo_bytes: 0x%x\n", fifo_bytes);
|
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
|
|
|
|
if (!fifo_bytes)
|
|
goto no_rx_data;
|
|
|
|
if (fifo_bytes > skb_tailroom(skb)) {
|
|
skb = skb_copy_expand(skb, skb_headroom(skb),
|
|
max_t(int, fifo_bytes,
|
|
TRF7970A_RX_SKB_ALLOC_SIZE),
|
|
GFP_KERNEL);
|
|
if (!skb) {
|
|
trf7970a_send_err_upstream(trf, -ENOMEM);
|
|
return;
|
|
}
|
|
|
|
kfree_skb(trf->rx_skb);
|
|
trf->rx_skb = skb;
|
|
}
|
|
|
|
ret = trf7970a_read_cont(trf, TRF7970A_FIFO_IO_REGISTER,
|
|
skb_put(skb, fifo_bytes), fifo_bytes);
|
|
if (ret) {
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
return;
|
|
}
|
|
|
|
/* If received Type 2 ACK/NACK, shift right 4 bits and pass up */
|
|
if ((trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T) && (skb->len == 1) &&
|
|
(trf->special_fcn_reg1 == TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX)) {
|
|
skb->data[0] >>= 4;
|
|
status = TRF7970A_IRQ_STATUS_SRX;
|
|
} else {
|
|
trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA_CONT;
|
|
|
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS, &fifo_bytes);
|
|
if (ret) {
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
return;
|
|
}
|
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
|
|
|
|
/* If there are bytes in the FIFO, set status to '0' so
|
|
* the if stmt below doesn't fire and the driver will wait
|
|
* for the trf7970a to generate another RX interrupt.
|
|
*/
|
|
if (fifo_bytes)
|
|
status = 0;
|
|
}
|
|
|
|
no_rx_data:
|
|
if (status == TRF7970A_IRQ_STATUS_SRX) { /* Receive complete */
|
|
trf7970a_send_upstream(trf);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(trf->dev, "Setting timeout for %d ms\n",
|
|
TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT);
|
|
|
|
schedule_delayed_work(&trf->timeout_work,
|
|
msecs_to_jiffies(TRF7970A_WAIT_FOR_RX_DATA_TIMEOUT));
|
|
}
|
|
|
|
static irqreturn_t trf7970a_irq(int irq, void *dev_id)
|
|
{
|
|
struct trf7970a *trf = dev_id;
|
|
int ret;
|
|
u8 status, fifo_bytes, iso_ctrl;
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
if (trf->state == TRF7970A_ST_RF_OFF) {
|
|
mutex_unlock(&trf->lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
ret = trf7970a_read_irqstatus(trf, &status);
|
|
if (ret) {
|
|
mutex_unlock(&trf->lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
dev_dbg(trf->dev, "IRQ - state: %d, status: 0x%x\n", trf->state,
|
|
status);
|
|
|
|
if (!status) {
|
|
mutex_unlock(&trf->lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
switch (trf->state) {
|
|
case TRF7970A_ST_IDLE:
|
|
case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
/* If initiator and getting interrupts caused by RF noise,
|
|
* turn off the receiver to avoid unnecessary interrupts.
|
|
* It will be turned back on in trf7970a_send_cmd() when
|
|
* the next command is issued.
|
|
*/
|
|
if (trf->is_initiator && (status & TRF7970A_IRQ_STATUS_ERROR)) {
|
|
trf7970a_cmd(trf, TRF7970A_CMD_BLOCK_RX);
|
|
trf->state = TRF7970A_ST_IDLE_RX_BLOCKED;
|
|
}
|
|
|
|
trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
break;
|
|
case TRF7970A_ST_WAIT_FOR_TX_FIFO:
|
|
if (status & TRF7970A_IRQ_STATUS_TX) {
|
|
trf->ignore_timeout =
|
|
!cancel_delayed_work(&trf->timeout_work);
|
|
trf7970a_fill_fifo(trf);
|
|
} else {
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
}
|
|
break;
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
if (status & TRF7970A_IRQ_STATUS_SRX) {
|
|
trf->ignore_timeout =
|
|
!cancel_delayed_work(&trf->timeout_work);
|
|
trf7970a_drain_fifo(trf, status);
|
|
} else if (status & TRF7970A_IRQ_STATUS_FIFO) {
|
|
ret = trf7970a_read(trf, TRF7970A_FIFO_STATUS,
|
|
&fifo_bytes);
|
|
|
|
fifo_bytes &= ~TRF7970A_FIFO_STATUS_OVERFLOW;
|
|
|
|
if (ret)
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
else if (!fifo_bytes)
|
|
trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
} else if ((status == TRF7970A_IRQ_STATUS_TX) ||
|
|
(!trf->is_initiator &&
|
|
(status == (TRF7970A_IRQ_STATUS_TX |
|
|
TRF7970A_IRQ_STATUS_NFC_RF)))) {
|
|
trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
|
|
if (!trf->timeout) {
|
|
trf->ignore_timeout =
|
|
!cancel_delayed_work(&trf->timeout_work);
|
|
trf->rx_skb = ERR_PTR(0);
|
|
trf7970a_send_upstream(trf);
|
|
break;
|
|
}
|
|
|
|
if (trf->is_initiator)
|
|
break;
|
|
|
|
iso_ctrl = trf->iso_ctrl;
|
|
|
|
switch (trf->framing) {
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
trf->iso_ctrl = 0xff; /* Force ISO_CTRL write */
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
|
|
ret = trf7970a_write(trf,
|
|
TRF7970A_SPECIAL_FCN_REG1,
|
|
TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL);
|
|
if (ret)
|
|
goto err_unlock_exit;
|
|
|
|
trf->special_fcn_reg1 =
|
|
TRF7970A_SPECIAL_FCN_REG1_14_ANTICOLL;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (iso_ctrl != trf->iso_ctrl) {
|
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
|
|
iso_ctrl);
|
|
if (ret)
|
|
goto err_unlock_exit;
|
|
|
|
trf->iso_ctrl = iso_ctrl;
|
|
}
|
|
} else {
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
}
|
|
break;
|
|
case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
|
|
if (status != TRF7970A_IRQ_STATUS_TX)
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
break;
|
|
case TRF7970A_ST_LISTENING:
|
|
if (status & TRF7970A_IRQ_STATUS_SRX) {
|
|
trf->ignore_timeout =
|
|
!cancel_delayed_work(&trf->timeout_work);
|
|
trf7970a_drain_fifo(trf, status);
|
|
} else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
}
|
|
break;
|
|
case TRF7970A_ST_LISTENING_MD:
|
|
if (status & TRF7970A_IRQ_STATUS_SRX) {
|
|
trf->ignore_timeout =
|
|
!cancel_delayed_work(&trf->timeout_work);
|
|
|
|
ret = trf7970a_mode_detect(trf, &trf->md_rf_tech);
|
|
if (ret) {
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
} else {
|
|
trf->state = TRF7970A_ST_LISTENING;
|
|
trf7970a_drain_fifo(trf, status);
|
|
}
|
|
} else if (!(status & TRF7970A_IRQ_STATUS_NFC_RF)) {
|
|
trf7970a_send_err_upstream(trf, -EIO);
|
|
}
|
|
break;
|
|
default:
|
|
dev_err(trf->dev, "%s - Driver in invalid state: %d\n",
|
|
__func__, trf->state);
|
|
}
|
|
|
|
err_unlock_exit:
|
|
mutex_unlock(&trf->lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void trf7970a_issue_eof(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Issuing EOF\n");
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_FIFO_RESET);
|
|
if (ret)
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_EOF);
|
|
if (ret)
|
|
trf7970a_send_err_upstream(trf, ret);
|
|
|
|
trf->state = TRF7970A_ST_WAIT_FOR_RX_DATA;
|
|
|
|
dev_dbg(trf->dev, "Setting timeout for %d ms, state: %d\n",
|
|
trf->timeout, trf->state);
|
|
|
|
schedule_delayed_work(&trf->timeout_work,
|
|
msecs_to_jiffies(trf->timeout));
|
|
}
|
|
|
|
static void trf7970a_timeout_work_handler(struct work_struct *work)
|
|
{
|
|
struct trf7970a *trf = container_of(work, struct trf7970a,
|
|
timeout_work.work);
|
|
|
|
dev_dbg(trf->dev, "Timeout - state: %d, ignore_timeout: %d\n",
|
|
trf->state, trf->ignore_timeout);
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
if (trf->ignore_timeout)
|
|
trf->ignore_timeout = false;
|
|
else if (trf->state == TRF7970A_ST_WAIT_FOR_RX_DATA_CONT)
|
|
trf7970a_drain_fifo(trf, TRF7970A_IRQ_STATUS_SRX);
|
|
else if (trf->state == TRF7970A_ST_WAIT_TO_ISSUE_EOF)
|
|
trf7970a_issue_eof(trf);
|
|
else
|
|
trf7970a_send_err_upstream(trf, -ETIMEDOUT);
|
|
|
|
mutex_unlock(&trf->lock);
|
|
}
|
|
|
|
static int trf7970a_init(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Initializing device - state: %d\n", trf->state);
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_SOFT_INIT);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_IDLE);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
|
|
trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
usleep_range(1000, 2000);
|
|
|
|
trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
|
|
trf->modulator_sys_clk_ctrl);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS,
|
|
TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLH_96 |
|
|
TRF7970A_ADJUTABLE_FIFO_IRQ_LEVELS_WLL_32);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1, 0);
|
|
if (ret)
|
|
goto err_out;
|
|
|
|
trf->special_fcn_reg1 = 0;
|
|
|
|
trf->iso_ctrl = 0xff;
|
|
return 0;
|
|
|
|
err_out:
|
|
dev_dbg(trf->dev, "Couldn't init device: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void trf7970a_switch_rf_off(struct trf7970a *trf)
|
|
{
|
|
if ((trf->state == TRF7970A_ST_PWR_OFF) ||
|
|
(trf->state == TRF7970A_ST_RF_OFF))
|
|
return;
|
|
|
|
dev_dbg(trf->dev, "Switching rf off\n");
|
|
|
|
trf->chip_status_ctrl &= ~TRF7970A_CHIP_STATUS_RF_ON;
|
|
|
|
trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL, trf->chip_status_ctrl);
|
|
|
|
trf->aborting = false;
|
|
trf->state = TRF7970A_ST_RF_OFF;
|
|
|
|
pm_runtime_mark_last_busy(trf->dev);
|
|
pm_runtime_put_autosuspend(trf->dev);
|
|
}
|
|
|
|
static int trf7970a_switch_rf_on(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Switching rf on\n");
|
|
|
|
pm_runtime_get_sync(trf->dev);
|
|
|
|
if (trf->state != TRF7970A_ST_RF_OFF) { /* Power on, RF off */
|
|
dev_err(trf->dev, "%s - Incorrect state: %d\n", __func__,
|
|
trf->state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = trf7970a_init(trf);
|
|
if (ret) {
|
|
dev_err(trf->dev, "%s - Can't initialize: %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
trf->state = TRF7970A_ST_IDLE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_switch_rf(struct nfc_digital_dev *ddev, bool on)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
int ret = 0;
|
|
|
|
dev_dbg(trf->dev, "Switching RF - state: %d, on: %d\n", trf->state, on);
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
if (on) {
|
|
switch (trf->state) {
|
|
case TRF7970A_ST_PWR_OFF:
|
|
case TRF7970A_ST_RF_OFF:
|
|
ret = trf7970a_switch_rf_on(trf);
|
|
break;
|
|
case TRF7970A_ST_IDLE:
|
|
case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
break;
|
|
default:
|
|
dev_err(trf->dev, "%s - Invalid request: %d %d\n",
|
|
__func__, trf->state, on);
|
|
trf7970a_switch_rf_off(trf);
|
|
ret = -EINVAL;
|
|
}
|
|
} else {
|
|
switch (trf->state) {
|
|
case TRF7970A_ST_PWR_OFF:
|
|
case TRF7970A_ST_RF_OFF:
|
|
break;
|
|
default:
|
|
dev_err(trf->dev, "%s - Invalid request: %d %d\n",
|
|
__func__, trf->state, on);
|
|
ret = -EINVAL;
|
|
/* FALLTHROUGH */
|
|
case TRF7970A_ST_IDLE:
|
|
case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
trf7970a_switch_rf_off(trf);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_in_config_rf_tech(struct trf7970a *trf, int tech)
|
|
{
|
|
int ret = 0;
|
|
|
|
dev_dbg(trf->dev, "rf technology: %d\n", tech);
|
|
|
|
switch (tech) {
|
|
case NFC_DIGITAL_RF_TECH_106A:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443A_106;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_OOK;
|
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCA;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_106B:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_14443B_106;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_ASK10;
|
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCB;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_212F:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_212;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_ASK10;
|
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_424F:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_FELICA_424;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_ASK10;
|
|
trf->guard_time = TRF7970A_GUARD_TIME_NFCF;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_ISO15693:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_OOK;
|
|
trf->guard_time = TRF7970A_GUARD_TIME_15693;
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
|
|
return -EINVAL;
|
|
}
|
|
|
|
trf->technology = tech;
|
|
|
|
/* If in initiator mode and not changing the RF tech due to a
|
|
* PSL sequence (indicated by 'trf->iso_ctrl == 0xff' from
|
|
* trf7970a_init()), clear the NFC Target Detection Level register
|
|
* due to erratum.
|
|
*/
|
|
if (trf->iso_ctrl == 0xff)
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_is_rf_field(struct trf7970a *trf, bool *is_rf_field)
|
|
{
|
|
int ret;
|
|
u8 rssi;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
|
|
trf->chip_status_ctrl |
|
|
TRF7970A_CHIP_STATUS_REC_ON);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_TEST_EXT_RF);
|
|
if (ret)
|
|
return ret;
|
|
|
|
usleep_range(50, 60);
|
|
|
|
ret = trf7970a_read(trf, TRF7970A_RSSI_OSC_STATUS, &rssi);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
|
|
trf->chip_status_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (rssi & TRF7970A_RSSI_OSC_STATUS_RSSI_MASK)
|
|
*is_rf_field = true;
|
|
else
|
|
*is_rf_field = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_in_config_framing(struct trf7970a *trf, int framing)
|
|
{
|
|
u8 iso_ctrl = trf->iso_ctrl_tech;
|
|
bool is_rf_field = false;
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "framing: %d\n", framing);
|
|
|
|
switch (framing) {
|
|
case NFC_DIGITAL_FRAMING_NFCA_SHORT:
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
|
|
case NFC_DIGITAL_FRAMING_NFCA_T4T:
|
|
case NFC_DIGITAL_FRAMING_NFCB:
|
|
case NFC_DIGITAL_FRAMING_NFCB_T4T:
|
|
case NFC_DIGITAL_FRAMING_NFCF:
|
|
case NFC_DIGITAL_FRAMING_NFCF_T3T:
|
|
case NFC_DIGITAL_FRAMING_ISO15693_INVENTORY:
|
|
case NFC_DIGITAL_FRAMING_ISO15693_T5T:
|
|
case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
|
|
case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCA_T2T:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
|
|
return -EINVAL;
|
|
}
|
|
|
|
trf->framing = framing;
|
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
|
|
ret = trf7970a_is_rf_field(trf, &is_rf_field);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (is_rf_field)
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (iso_ctrl != trf->iso_ctrl) {
|
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->iso_ctrl = iso_ctrl;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
|
|
trf->modulator_sys_clk_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
|
|
trf->chip_status_ctrl |
|
|
TRF7970A_CHIP_STATUS_RF_ON);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
|
|
|
|
usleep_range(trf->guard_time, trf->guard_time + 1000);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_in_configure_hw(struct nfc_digital_dev *ddev, int type,
|
|
int param)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
trf->is_initiator = true;
|
|
|
|
if ((trf->state == TRF7970A_ST_PWR_OFF) ||
|
|
(trf->state == TRF7970A_ST_RF_OFF)) {
|
|
ret = trf7970a_switch_rf_on(trf);
|
|
if (ret)
|
|
goto err_unlock;
|
|
}
|
|
|
|
switch (type) {
|
|
case NFC_DIGITAL_CONFIG_RF_TECH:
|
|
ret = trf7970a_in_config_rf_tech(trf, param);
|
|
break;
|
|
case NFC_DIGITAL_CONFIG_FRAMING:
|
|
ret = trf7970a_in_config_framing(trf, param);
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unknown type: %d\n", type);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
err_unlock:
|
|
mutex_unlock(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_is_iso15693_write_or_lock(u8 cmd)
|
|
{
|
|
switch (cmd) {
|
|
case ISO15693_CMD_WRITE_SINGLE_BLOCK:
|
|
case ISO15693_CMD_LOCK_BLOCK:
|
|
case ISO15693_CMD_WRITE_MULTIPLE_BLOCK:
|
|
case ISO15693_CMD_WRITE_AFI:
|
|
case ISO15693_CMD_LOCK_AFI:
|
|
case ISO15693_CMD_WRITE_DSFID:
|
|
case ISO15693_CMD_LOCK_DSFID:
|
|
return 1;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int trf7970a_per_cmd_config(struct trf7970a *trf, struct sk_buff *skb)
|
|
{
|
|
u8 *req = skb->data;
|
|
u8 special_fcn_reg1, iso_ctrl;
|
|
int ret;
|
|
|
|
trf->issue_eof = false;
|
|
|
|
/* When issuing Type 2 read command, make sure the '4_bit_RX' bit in
|
|
* special functions register 1 is cleared; otherwise, its a write or
|
|
* sector select command and '4_bit_RX' must be set.
|
|
*
|
|
* When issuing an ISO 15693 command, inspect the flags byte to see
|
|
* what speed to use. Also, remember if the OPTION flag is set on
|
|
* a Type 5 write or lock command so the driver will know that it
|
|
* has to send an EOF in order to get a response.
|
|
*/
|
|
if ((trf->technology == NFC_DIGITAL_RF_TECH_106A) &&
|
|
(trf->framing == NFC_DIGITAL_FRAMING_NFCA_T2T)) {
|
|
if (req[0] == NFC_T2T_CMD_READ)
|
|
special_fcn_reg1 = 0;
|
|
else
|
|
special_fcn_reg1 = TRF7970A_SPECIAL_FCN_REG1_4_BIT_RX;
|
|
|
|
if (special_fcn_reg1 != trf->special_fcn_reg1) {
|
|
ret = trf7970a_write(trf, TRF7970A_SPECIAL_FCN_REG1,
|
|
special_fcn_reg1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->special_fcn_reg1 = special_fcn_reg1;
|
|
}
|
|
} else if (trf->technology == NFC_DIGITAL_RF_TECH_ISO15693) {
|
|
iso_ctrl = trf->iso_ctrl & ~TRF7970A_ISO_CTRL_RFID_SPEED_MASK;
|
|
|
|
switch (req[0] & ISO15693_REQ_FLAG_SPEED_MASK) {
|
|
case 0x00:
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_662;
|
|
break;
|
|
case ISO15693_REQ_FLAG_SUB_CARRIER:
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_667a;
|
|
break;
|
|
case ISO15693_REQ_FLAG_DATA_RATE:
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_15693_SGL_1OF4_2648;
|
|
break;
|
|
case (ISO15693_REQ_FLAG_SUB_CARRIER |
|
|
ISO15693_REQ_FLAG_DATA_RATE):
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_15693_DBL_1OF4_2669;
|
|
break;
|
|
}
|
|
|
|
if (iso_ctrl != trf->iso_ctrl) {
|
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->iso_ctrl = iso_ctrl;
|
|
}
|
|
|
|
if ((trf->framing == NFC_DIGITAL_FRAMING_ISO15693_T5T) &&
|
|
trf7970a_is_iso15693_write_or_lock(req[1]) &&
|
|
(req[0] & ISO15693_REQ_FLAG_OPTION))
|
|
trf->issue_eof = true;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_send_cmd(struct nfc_digital_dev *ddev,
|
|
struct sk_buff *skb, u16 timeout,
|
|
nfc_digital_cmd_complete_t cb, void *arg)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
u8 prefix[5];
|
|
unsigned int len;
|
|
int ret;
|
|
u8 status;
|
|
|
|
dev_dbg(trf->dev, "New request - state: %d, timeout: %d ms, len: %d\n",
|
|
trf->state, timeout, skb->len);
|
|
|
|
if (skb->len > TRF7970A_TX_MAX)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
if ((trf->state != TRF7970A_ST_IDLE) &&
|
|
(trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
|
|
dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
|
|
trf->state);
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
if (trf->aborting) {
|
|
dev_dbg(trf->dev, "Abort process complete\n");
|
|
trf->aborting = false;
|
|
ret = -ECANCELED;
|
|
goto out_err;
|
|
}
|
|
|
|
if (timeout) {
|
|
trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
|
|
GFP_KERNEL);
|
|
if (!trf->rx_skb) {
|
|
dev_dbg(trf->dev, "Can't alloc rx_skb\n");
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
if (trf->state == TRF7970A_ST_IDLE_RX_BLOCKED) {
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
trf->state = TRF7970A_ST_IDLE;
|
|
}
|
|
|
|
if (trf->is_initiator) {
|
|
ret = trf7970a_per_cmd_config(trf, skb);
|
|
if (ret)
|
|
goto out_err;
|
|
}
|
|
|
|
trf->ddev = ddev;
|
|
trf->tx_skb = skb;
|
|
trf->cb = cb;
|
|
trf->cb_arg = arg;
|
|
trf->timeout = timeout;
|
|
trf->ignore_timeout = false;
|
|
|
|
len = skb->len;
|
|
|
|
/* TX data must be prefixed with a FIFO reset cmd, a cmd that depends
|
|
* on what the current framing is, the address of the TX length byte 1
|
|
* register (0x1d), and the 2 byte length of the data to be transmitted.
|
|
* That totals 5 bytes.
|
|
*/
|
|
prefix[0] = TRF7970A_CMD_BIT_CTRL |
|
|
TRF7970A_CMD_BIT_OPCODE(TRF7970A_CMD_FIFO_RESET);
|
|
prefix[1] = TRF7970A_CMD_BIT_CTRL |
|
|
TRF7970A_CMD_BIT_OPCODE(trf->tx_cmd);
|
|
prefix[2] = TRF7970A_CMD_BIT_CONTINUOUS | TRF7970A_TX_LENGTH_BYTE1;
|
|
|
|
if (trf->framing == NFC_DIGITAL_FRAMING_NFCA_SHORT) {
|
|
prefix[3] = 0x00;
|
|
prefix[4] = 0x0f; /* 7 bits */
|
|
} else {
|
|
prefix[3] = (len & 0xf00) >> 4;
|
|
prefix[3] |= ((len & 0xf0) >> 4);
|
|
prefix[4] = ((len & 0x0f) << 4);
|
|
}
|
|
|
|
len = min_t(int, skb->len, TRF7970A_FIFO_SIZE);
|
|
|
|
/* Clear possible spurious interrupt */
|
|
ret = trf7970a_read_irqstatus(trf, &status);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
ret = trf7970a_transmit(trf, skb, len, prefix, sizeof(prefix));
|
|
if (ret) {
|
|
kfree_skb(trf->rx_skb);
|
|
trf->rx_skb = NULL;
|
|
}
|
|
|
|
out_err:
|
|
mutex_unlock(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_tg_config_rf_tech(struct trf7970a *trf, int tech)
|
|
{
|
|
int ret = 0;
|
|
|
|
dev_dbg(trf->dev, "rf technology: %d\n", tech);
|
|
|
|
switch (tech) {
|
|
case NFC_DIGITAL_RF_TECH_106A:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
|
|
TRF7970A_ISO_CTRL_NFC_CE | TRF7970A_ISO_CTRL_NFC_CE_14443A;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_OOK;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_212F:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
|
|
TRF7970A_ISO_CTRL_NFC_NFCF_212;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_ASK10;
|
|
break;
|
|
case NFC_DIGITAL_RF_TECH_424F:
|
|
trf->iso_ctrl_tech = TRF7970A_ISO_CTRL_NFC_NFC_CE_MODE |
|
|
TRF7970A_ISO_CTRL_NFC_NFCF_424;
|
|
trf->modulator_sys_clk_ctrl =
|
|
(trf->modulator_sys_clk_ctrl & 0xf8) |
|
|
TRF7970A_MODULATOR_DEPTH_ASK10;
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unsupported rf technology: %d\n", tech);
|
|
return -EINVAL;
|
|
}
|
|
|
|
trf->technology = tech;
|
|
|
|
/* Normally we write the ISO_CTRL register in
|
|
* trf7970a_tg_config_framing() because the framing can change
|
|
* the value written. However, when sending a PSL RES,
|
|
* digital_tg_send_psl_res_complete() doesn't call
|
|
* trf7970a_tg_config_framing() so we must write the register
|
|
* here.
|
|
*/
|
|
if ((trf->framing == NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED) &&
|
|
(trf->iso_ctrl_tech != trf->iso_ctrl)) {
|
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL,
|
|
trf->iso_ctrl_tech);
|
|
|
|
trf->iso_ctrl = trf->iso_ctrl_tech;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Since this is a target routine, several of the framing calls are
|
|
* made between receiving the request and sending the response so they
|
|
* should take effect until after the response is sent. This is accomplished
|
|
* by skipping the ISO_CTRL register write here and doing it in the interrupt
|
|
* handler.
|
|
*/
|
|
static int trf7970a_tg_config_framing(struct trf7970a *trf, int framing)
|
|
{
|
|
u8 iso_ctrl = trf->iso_ctrl_tech;
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "framing: %d\n", framing);
|
|
|
|
switch (framing) {
|
|
case NFC_DIGITAL_FRAMING_NFCA_NFC_DEP:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT_NO_CRC;
|
|
iso_ctrl |= TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD:
|
|
case NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A:
|
|
case NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE:
|
|
/* These ones are applied in the interrupt handler */
|
|
iso_ctrl = trf->iso_ctrl; /* Don't write to ISO_CTRL yet */
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFCF_NFC_DEP:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
case NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED:
|
|
trf->tx_cmd = TRF7970A_CMD_TRANSMIT;
|
|
iso_ctrl &= ~TRF7970A_ISO_CTRL_RX_CRC_N;
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unsupported Framing: %d\n", framing);
|
|
return -EINVAL;
|
|
}
|
|
|
|
trf->framing = framing;
|
|
|
|
if (iso_ctrl != trf->iso_ctrl) {
|
|
ret = trf7970a_write(trf, TRF7970A_ISO_CTRL, iso_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->iso_ctrl = iso_ctrl;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_MODULATOR_SYS_CLK_CTRL,
|
|
trf->modulator_sys_clk_ctrl);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (!(trf->chip_status_ctrl & TRF7970A_CHIP_STATUS_RF_ON)) {
|
|
ret = trf7970a_write(trf, TRF7970A_CHIP_STATUS_CTRL,
|
|
trf->chip_status_ctrl |
|
|
TRF7970A_CHIP_STATUS_RF_ON);
|
|
if (ret)
|
|
return ret;
|
|
|
|
trf->chip_status_ctrl |= TRF7970A_CHIP_STATUS_RF_ON;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
|
|
int param)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Configure hw - type: %d, param: %d\n", type, param);
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
trf->is_initiator = false;
|
|
|
|
if ((trf->state == TRF7970A_ST_PWR_OFF) ||
|
|
(trf->state == TRF7970A_ST_RF_OFF)) {
|
|
ret = trf7970a_switch_rf_on(trf);
|
|
if (ret)
|
|
goto err_unlock;
|
|
}
|
|
|
|
switch (type) {
|
|
case NFC_DIGITAL_CONFIG_RF_TECH:
|
|
ret = trf7970a_tg_config_rf_tech(trf, param);
|
|
break;
|
|
case NFC_DIGITAL_CONFIG_FRAMING:
|
|
ret = trf7970a_tg_config_framing(trf, param);
|
|
break;
|
|
default:
|
|
dev_dbg(trf->dev, "Unknown type: %d\n", type);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
err_unlock:
|
|
mutex_unlock(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int _trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
|
|
nfc_digital_cmd_complete_t cb, void *arg,
|
|
bool mode_detect)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
int ret;
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
if ((trf->state != TRF7970A_ST_IDLE) &&
|
|
(trf->state != TRF7970A_ST_IDLE_RX_BLOCKED)) {
|
|
dev_err(trf->dev, "%s - Bogus state: %d\n", __func__,
|
|
trf->state);
|
|
ret = -EIO;
|
|
goto out_err;
|
|
}
|
|
|
|
if (trf->aborting) {
|
|
dev_dbg(trf->dev, "Abort process complete\n");
|
|
trf->aborting = false;
|
|
ret = -ECANCELED;
|
|
goto out_err;
|
|
}
|
|
|
|
trf->rx_skb = nfc_alloc_recv_skb(TRF7970A_RX_SKB_ALLOC_SIZE,
|
|
GFP_KERNEL);
|
|
if (!trf->rx_skb) {
|
|
dev_dbg(trf->dev, "Can't alloc rx_skb\n");
|
|
ret = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_RX_SPECIAL_SETTINGS,
|
|
TRF7970A_RX_SPECIAL_SETTINGS_HBT |
|
|
TRF7970A_RX_SPECIAL_SETTINGS_M848 |
|
|
TRF7970A_RX_SPECIAL_SETTINGS_C424 |
|
|
TRF7970A_RX_SPECIAL_SETTINGS_C212);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_REG_IO_CTRL,
|
|
trf->io_ctrl | TRF7970A_REG_IO_CTRL_VRS(0x1));
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_LOW_FIELD_LEVEL,
|
|
TRF7970A_NFC_LOW_FIELD_LEVEL_RFDET(0x3));
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
ret = trf7970a_write(trf, TRF7970A_NFC_TARGET_LEVEL,
|
|
TRF7970A_NFC_TARGET_LEVEL_RFDET(0x7));
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
trf->ddev = ddev;
|
|
trf->cb = cb;
|
|
trf->cb_arg = arg;
|
|
trf->timeout = timeout;
|
|
trf->ignore_timeout = false;
|
|
|
|
ret = trf7970a_cmd(trf, TRF7970A_CMD_ENABLE_RX);
|
|
if (ret)
|
|
goto out_err;
|
|
|
|
trf->state = mode_detect ? TRF7970A_ST_LISTENING_MD :
|
|
TRF7970A_ST_LISTENING;
|
|
|
|
schedule_delayed_work(&trf->timeout_work, msecs_to_jiffies(timeout));
|
|
|
|
out_err:
|
|
mutex_unlock(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
|
|
nfc_digital_cmd_complete_t cb, void *arg)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
|
dev_dbg(trf->dev, "Listen - state: %d, timeout: %d ms\n",
|
|
trf->state, timeout);
|
|
|
|
return _trf7970a_tg_listen(ddev, timeout, cb, arg, false);
|
|
}
|
|
|
|
static int trf7970a_tg_listen_md(struct nfc_digital_dev *ddev,
|
|
u16 timeout, nfc_digital_cmd_complete_t cb,
|
|
void *arg)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Listen MD - state: %d, timeout: %d ms\n",
|
|
trf->state, timeout);
|
|
|
|
ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
|
|
NFC_DIGITAL_RF_TECH_106A);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = trf7970a_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
|
|
NFC_DIGITAL_FRAMING_NFCA_NFC_DEP);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return _trf7970a_tg_listen(ddev, timeout, cb, arg, true);
|
|
}
|
|
|
|
static int trf7970a_tg_get_rf_tech(struct nfc_digital_dev *ddev, u8 *rf_tech)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
|
dev_dbg(trf->dev, "Get RF Tech - state: %d, rf_tech: %d\n",
|
|
trf->state, trf->md_rf_tech);
|
|
|
|
*rf_tech = trf->md_rf_tech;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void trf7970a_abort_cmd(struct nfc_digital_dev *ddev)
|
|
{
|
|
struct trf7970a *trf = nfc_digital_get_drvdata(ddev);
|
|
|
|
dev_dbg(trf->dev, "Abort process initiated\n");
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
switch (trf->state) {
|
|
case TRF7970A_ST_WAIT_FOR_TX_FIFO:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
|
|
trf->aborting = true;
|
|
break;
|
|
case TRF7970A_ST_LISTENING:
|
|
trf->ignore_timeout = !cancel_delayed_work(&trf->timeout_work);
|
|
trf7970a_send_err_upstream(trf, -ECANCELED);
|
|
dev_dbg(trf->dev, "Abort process complete\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&trf->lock);
|
|
}
|
|
|
|
static struct nfc_digital_ops trf7970a_nfc_ops = {
|
|
.in_configure_hw = trf7970a_in_configure_hw,
|
|
.in_send_cmd = trf7970a_send_cmd,
|
|
.tg_configure_hw = trf7970a_tg_configure_hw,
|
|
.tg_send_cmd = trf7970a_send_cmd,
|
|
.tg_listen = trf7970a_tg_listen,
|
|
.tg_listen_md = trf7970a_tg_listen_md,
|
|
.tg_get_rf_tech = trf7970a_tg_get_rf_tech,
|
|
.switch_rf = trf7970a_switch_rf,
|
|
.abort_cmd = trf7970a_abort_cmd,
|
|
};
|
|
|
|
static int trf7970a_power_up(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Powering up - state: %d\n", trf->state);
|
|
|
|
if (trf->state != TRF7970A_ST_PWR_OFF)
|
|
return 0;
|
|
|
|
ret = regulator_enable(trf->regulator);
|
|
if (ret) {
|
|
dev_err(trf->dev, "%s - Can't enable VIN: %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
usleep_range(5000, 6000);
|
|
|
|
if (trf->en2_gpiod &&
|
|
!(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW)) {
|
|
gpiod_set_value_cansleep(trf->en2_gpiod, 1);
|
|
usleep_range(1000, 2000);
|
|
}
|
|
|
|
gpiod_set_value_cansleep(trf->en_gpiod, 1);
|
|
|
|
usleep_range(20000, 21000);
|
|
|
|
trf->state = TRF7970A_ST_RF_OFF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_power_down(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(trf->dev, "Powering down - state: %d\n", trf->state);
|
|
|
|
if (trf->state == TRF7970A_ST_PWR_OFF)
|
|
return 0;
|
|
|
|
if (trf->state != TRF7970A_ST_RF_OFF) {
|
|
dev_dbg(trf->dev, "Can't power down - not RF_OFF state (%d)\n",
|
|
trf->state);
|
|
return -EBUSY;
|
|
}
|
|
|
|
gpiod_set_value_cansleep(trf->en_gpiod, 0);
|
|
|
|
if (trf->en2_gpiod && !(trf->quirks & TRF7970A_QUIRK_EN2_MUST_STAY_LOW))
|
|
gpiod_set_value_cansleep(trf->en2_gpiod, 0);
|
|
|
|
ret = regulator_disable(trf->regulator);
|
|
if (ret)
|
|
dev_err(trf->dev, "%s - Can't disable VIN: %d\n", __func__,
|
|
ret);
|
|
|
|
trf->state = TRF7970A_ST_PWR_OFF;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_startup(struct trf7970a *trf)
|
|
{
|
|
int ret;
|
|
|
|
ret = trf7970a_power_up(trf);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pm_runtime_set_active(trf->dev);
|
|
pm_runtime_enable(trf->dev);
|
|
pm_runtime_mark_last_busy(trf->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void trf7970a_shutdown(struct trf7970a *trf)
|
|
{
|
|
switch (trf->state) {
|
|
case TRF7970A_ST_WAIT_FOR_TX_FIFO:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA:
|
|
case TRF7970A_ST_WAIT_FOR_RX_DATA_CONT:
|
|
case TRF7970A_ST_WAIT_TO_ISSUE_EOF:
|
|
case TRF7970A_ST_LISTENING:
|
|
trf7970a_send_err_upstream(trf, -ECANCELED);
|
|
/* FALLTHROUGH */
|
|
case TRF7970A_ST_IDLE:
|
|
case TRF7970A_ST_IDLE_RX_BLOCKED:
|
|
trf7970a_switch_rf_off(trf);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
pm_runtime_disable(trf->dev);
|
|
pm_runtime_set_suspended(trf->dev);
|
|
|
|
trf7970a_power_down(trf);
|
|
}
|
|
|
|
static int trf7970a_get_autosuspend_delay(struct device_node *np)
|
|
{
|
|
int autosuspend_delay, ret;
|
|
|
|
ret = of_property_read_u32(np, "autosuspend-delay", &autosuspend_delay);
|
|
if (ret)
|
|
autosuspend_delay = TRF7970A_AUTOSUSPEND_DELAY;
|
|
|
|
return autosuspend_delay;
|
|
}
|
|
|
|
static int trf7970a_probe(struct spi_device *spi)
|
|
{
|
|
struct device_node *np = spi->dev.of_node;
|
|
struct trf7970a *trf;
|
|
int uvolts, autosuspend_delay, ret;
|
|
u32 clk_freq = TRF7970A_13MHZ_CLOCK_FREQUENCY;
|
|
|
|
if (!np) {
|
|
dev_err(&spi->dev, "No Device Tree entry\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
trf = devm_kzalloc(&spi->dev, sizeof(*trf), GFP_KERNEL);
|
|
if (!trf)
|
|
return -ENOMEM;
|
|
|
|
trf->state = TRF7970A_ST_PWR_OFF;
|
|
trf->dev = &spi->dev;
|
|
trf->spi = spi;
|
|
|
|
spi->mode = SPI_MODE_1;
|
|
spi->bits_per_word = 8;
|
|
|
|
ret = spi_setup(spi);
|
|
if (ret < 0) {
|
|
dev_err(trf->dev, "Can't set up SPI Communication\n");
|
|
return ret;
|
|
}
|
|
|
|
if (of_property_read_bool(np, "irq-status-read-quirk"))
|
|
trf->quirks |= TRF7970A_QUIRK_IRQ_STATUS_READ;
|
|
|
|
/* There are two enable pins - only EN must be present in the DT */
|
|
trf->en_gpiod = devm_gpiod_get_index(trf->dev, "ti,enable", 0,
|
|
GPIOD_OUT_LOW);
|
|
if (IS_ERR(trf->en_gpiod)) {
|
|
dev_err(trf->dev, "No EN GPIO property\n");
|
|
return PTR_ERR(trf->en_gpiod);
|
|
}
|
|
|
|
trf->en2_gpiod = devm_gpiod_get_index_optional(trf->dev, "ti,enable", 1,
|
|
GPIOD_OUT_LOW);
|
|
if (!trf->en2_gpiod) {
|
|
dev_info(trf->dev, "No EN2 GPIO property\n");
|
|
} else if (IS_ERR(trf->en2_gpiod)) {
|
|
dev_err(trf->dev, "Error getting EN2 GPIO property: %ld\n",
|
|
PTR_ERR(trf->en2_gpiod));
|
|
return PTR_ERR(trf->en2_gpiod);
|
|
} else if (of_property_read_bool(np, "en2-rf-quirk")) {
|
|
trf->quirks |= TRF7970A_QUIRK_EN2_MUST_STAY_LOW;
|
|
}
|
|
|
|
of_property_read_u32(np, "clock-frequency", &clk_freq);
|
|
if ((clk_freq != TRF7970A_27MHZ_CLOCK_FREQUENCY) &&
|
|
(clk_freq != TRF7970A_13MHZ_CLOCK_FREQUENCY)) {
|
|
dev_err(trf->dev,
|
|
"clock-frequency (%u Hz) unsupported\n", clk_freq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (clk_freq == TRF7970A_27MHZ_CLOCK_FREQUENCY) {
|
|
trf->modulator_sys_clk_ctrl = TRF7970A_MODULATOR_27MHZ;
|
|
dev_dbg(trf->dev, "trf7970a configured for 27MHz crystal\n");
|
|
} else {
|
|
trf->modulator_sys_clk_ctrl = 0;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(trf->dev, spi->irq, NULL,
|
|
trf7970a_irq,
|
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
"trf7970a", trf);
|
|
if (ret) {
|
|
dev_err(trf->dev, "Can't request IRQ#%d: %d\n", spi->irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
mutex_init(&trf->lock);
|
|
INIT_DELAYED_WORK(&trf->timeout_work, trf7970a_timeout_work_handler);
|
|
|
|
trf->regulator = devm_regulator_get(&spi->dev, "vin");
|
|
if (IS_ERR(trf->regulator)) {
|
|
ret = PTR_ERR(trf->regulator);
|
|
dev_err(trf->dev, "Can't get VIN regulator: %d\n", ret);
|
|
goto err_destroy_lock;
|
|
}
|
|
|
|
ret = regulator_enable(trf->regulator);
|
|
if (ret) {
|
|
dev_err(trf->dev, "Can't enable VIN: %d\n", ret);
|
|
goto err_destroy_lock;
|
|
}
|
|
|
|
uvolts = regulator_get_voltage(trf->regulator);
|
|
if (uvolts > 4000000)
|
|
trf->chip_status_ctrl = TRF7970A_CHIP_STATUS_VRS5_3;
|
|
|
|
trf->regulator = devm_regulator_get(&spi->dev, "vdd-io");
|
|
if (IS_ERR(trf->regulator)) {
|
|
ret = PTR_ERR(trf->regulator);
|
|
dev_err(trf->dev, "Can't get VDD_IO regulator: %d\n", ret);
|
|
goto err_destroy_lock;
|
|
}
|
|
|
|
ret = regulator_enable(trf->regulator);
|
|
if (ret) {
|
|
dev_err(trf->dev, "Can't enable VDD_IO: %d\n", ret);
|
|
goto err_destroy_lock;
|
|
}
|
|
|
|
if (regulator_get_voltage(trf->regulator) == 1800000) {
|
|
trf->io_ctrl = TRF7970A_REG_IO_CTRL_IO_LOW;
|
|
dev_dbg(trf->dev, "trf7970a config vdd_io to 1.8V\n");
|
|
}
|
|
|
|
trf->ddev = nfc_digital_allocate_device(&trf7970a_nfc_ops,
|
|
TRF7970A_SUPPORTED_PROTOCOLS,
|
|
NFC_DIGITAL_DRV_CAPS_IN_CRC |
|
|
NFC_DIGITAL_DRV_CAPS_TG_CRC, 0,
|
|
0);
|
|
if (!trf->ddev) {
|
|
dev_err(trf->dev, "Can't allocate NFC digital device\n");
|
|
ret = -ENOMEM;
|
|
goto err_disable_regulator;
|
|
}
|
|
|
|
nfc_digital_set_parent_dev(trf->ddev, trf->dev);
|
|
nfc_digital_set_drvdata(trf->ddev, trf);
|
|
spi_set_drvdata(spi, trf);
|
|
|
|
autosuspend_delay = trf7970a_get_autosuspend_delay(np);
|
|
|
|
pm_runtime_set_autosuspend_delay(trf->dev, autosuspend_delay);
|
|
pm_runtime_use_autosuspend(trf->dev);
|
|
|
|
ret = trf7970a_startup(trf);
|
|
if (ret)
|
|
goto err_free_ddev;
|
|
|
|
ret = nfc_digital_register_device(trf->ddev);
|
|
if (ret) {
|
|
dev_err(trf->dev, "Can't register NFC digital device: %d\n",
|
|
ret);
|
|
goto err_shutdown;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_shutdown:
|
|
trf7970a_shutdown(trf);
|
|
err_free_ddev:
|
|
nfc_digital_free_device(trf->ddev);
|
|
err_disable_regulator:
|
|
regulator_disable(trf->regulator);
|
|
err_destroy_lock:
|
|
mutex_destroy(&trf->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_remove(struct spi_device *spi)
|
|
{
|
|
struct trf7970a *trf = spi_get_drvdata(spi);
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
trf7970a_shutdown(trf);
|
|
|
|
mutex_unlock(&trf->lock);
|
|
|
|
nfc_digital_unregister_device(trf->ddev);
|
|
nfc_digital_free_device(trf->ddev);
|
|
|
|
regulator_disable(trf->regulator);
|
|
|
|
mutex_destroy(&trf->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int trf7970a_suspend(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct trf7970a *trf = spi_get_drvdata(spi);
|
|
|
|
dev_dbg(dev, "Suspend\n");
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
trf7970a_shutdown(trf);
|
|
|
|
mutex_unlock(&trf->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int trf7970a_resume(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct trf7970a *trf = spi_get_drvdata(spi);
|
|
int ret;
|
|
|
|
dev_dbg(dev, "Resume\n");
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
ret = trf7970a_startup(trf);
|
|
|
|
mutex_unlock(&trf->lock);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_PM
|
|
static int trf7970a_pm_runtime_suspend(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct trf7970a *trf = spi_get_drvdata(spi);
|
|
int ret;
|
|
|
|
dev_dbg(dev, "Runtime suspend\n");
|
|
|
|
mutex_lock(&trf->lock);
|
|
|
|
ret = trf7970a_power_down(trf);
|
|
|
|
mutex_unlock(&trf->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int trf7970a_pm_runtime_resume(struct device *dev)
|
|
{
|
|
struct spi_device *spi = to_spi_device(dev);
|
|
struct trf7970a *trf = spi_get_drvdata(spi);
|
|
int ret;
|
|
|
|
dev_dbg(dev, "Runtime resume\n");
|
|
|
|
ret = trf7970a_power_up(trf);
|
|
if (!ret)
|
|
pm_runtime_mark_last_busy(dev);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
static const struct dev_pm_ops trf7970a_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(trf7970a_suspend, trf7970a_resume)
|
|
SET_RUNTIME_PM_OPS(trf7970a_pm_runtime_suspend,
|
|
trf7970a_pm_runtime_resume, NULL)
|
|
};
|
|
|
|
static const struct of_device_id trf7970a_of_match[] = {
|
|
{.compatible = "ti,trf7970a",},
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, trf7970a_of_match);
|
|
|
|
static const struct spi_device_id trf7970a_id_table[] = {
|
|
{"trf7970a", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(spi, trf7970a_id_table);
|
|
|
|
static struct spi_driver trf7970a_spi_driver = {
|
|
.probe = trf7970a_probe,
|
|
.remove = trf7970a_remove,
|
|
.id_table = trf7970a_id_table,
|
|
.driver = {
|
|
.name = "trf7970a",
|
|
.of_match_table = of_match_ptr(trf7970a_of_match),
|
|
.pm = &trf7970a_pm_ops,
|
|
},
|
|
};
|
|
|
|
module_spi_driver(trf7970a_spi_driver);
|
|
|
|
MODULE_AUTHOR("Mark A. Greer <mgreer@animalcreek.com>");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("TI trf7970a RFID/NFC Transceiver Driver");
|